Perhaps you should try some spelling variations:
trinh cac » trinh chat, trinh chao, trinh cham
cac doanh » cac dang, van doanh, cho doanh
trinh mat » trinh vat, trinh may, trinh mau
trinh cau » trinh chat, trinh chao, trinh tu
hoi viet » hai viet, thai viet, cuoi viet
sach cap » sach dao, sach bai, sach xa
co nguoi » cho nguoi, con nguoi, o nguoi
cam doan » chan doan, cam hoang, cao doanh
san viet » gian viet, anh viet
cong san » cong tac
cay cong » cac cong, cao cong, cau cong
cac cau » cac mau, bac cau, ca cau
oi viet » o viet, cuoi viet, gioi viet
va sach » van sach, va cach, a sach
cac tap » cac cap, cac tac, cac tai
cau dan » cau danh, ca dan, cu dan
cac cay » ca cay, cac cam, cac cap
cap co » cap cho, tap co, cap do
cau co » cau do, cac co, cay co
co hoi » co hoc, co loi
dan va » doan va, dan ca, ban va
co oi » co loi, co doi, co toi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( cong trinh cac dan va cac cay cong san viet nam ) or ((((( cong trinh ((cam doan) OR (cac doanh)) va sach cap co hoi viet nam ) or ( cong trinh cau dan va cac cau co oi viet nam ))) or ( cong ((trinh mat) or (sinh vat)) dan va cac tap ((co gioi) or (co nguoi)) viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cac dan va cac cay cong san viet nam ) OR ((((( cong trinh ((cam doan) OR (cac doanh)) va sach cap co hoi viet nam ) OR ( cong trinh cau dan va cac cau co oi viet nam ))) OR ( cong ((trinh mat) OR (sinh vat)) dan va cac tap ((co gioi) OR (co nguoi)) viet nam ))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cac dan va cac cay cong san viet nam ) or ((((( cong trinh ((cam doan) OR (cac doanh)) va sach cap co hoi viet nam ) or ( cong trinh cau dan va cac cau co oi viet nam ))) or ( cong ((trinh mat) or (sinh vat)) dan va cac tap ((co gioi) or (co nguoi)) viet nam ))))*".